反应详情

A method for synthesizing 3-(1-propenyl)-1,5-dihydro-3H-2,4-benzodioxepine is illustrated in Scheme 3. 1,2-Benzenedimethanol (500 mg, 3.62 mmol) and p-toluenesulfonic acid (172 mg, 0.9 mmol) were dissolved in 2 mL of dry DME and triethylortoformate (0.396 mL, 3.62 mmol) was added. The solution was stirred at rt. and under argon for 1 h. Ether (20 mL) was added and the organic layer washed with a saturated solution of NaHCO3 and water, then dried (Na2SO4). The solvent was evaporated giving crude 3-methoxy-1,5-dihydro-3H-2,4 benzodioxepine as a colorless oil (526 mg, 89%).

1. additiontriethylortoformate (0.396 mL, 3.62 mmol) was added
2. washthe organic layer washed with a saturated solution of NaHCO3 and water
3. dry with materialdried (Na2SO4)
4. customThe solvent was evaporated